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I'm using reader.readAsArrayBuffer() to send a file to node.js so that i can save it in a /public folder.
reader.readAsArrayBuffer(event.currentTarget.files[0])
When the read is done it calls a Meteor.method()
reader.addEventListener("loadend", function(evt){
Meteor.call("saveFile", reader.result)
})
The meteor method receives a file and saves it to my public/folder.
saveFile:function(file){
var fs = Npm.require("fs")
fs.writeFile('../../../../../public/logo/jow.png', file, {encoding:"binary"}, function (err) {
console.log(err)
console.log("file saved")
});
}
However, the problem is that i never get the encoding right, and when opening the file in /public/logo/jow.png i get this message:
jow.png can not be read, it may be damaged.
But when i change readAsArrayBuffer() to readAsBinaryString() it works as expected and i can open the image.
Any ideas?
542
Is because readAsArrayBuffer sends the info in binary data (blob).
And if you view de docs in nodejs Buffers and character encodings the binary encoding is an alias of a latin1 encoding.
I don't know about meteor but if the file is a Buffer you can send it as is.
Example:
<body>
<input type="file" />
<button onclick="sendFile();">sendFile</button>
<script>
const sendFile = async () => {
const reader = new FileReader();
const file = document.querySelector('input[type=file]').files[0];
reader.onloadend = function () {
var xmlHttpRequest = new XMLHttpRequest();
xmlHttpRequest.open("POST", 'http:/localhost:1234/', true);
xmlHttpRequest.setRequestHeader("Content-Type", file.type);
xmlHttpRequest.send(reader.result);
}
reader.readAsArrayBuffer(file);
};
</script>
</body>
const http = require("http");
const fs = require("fs");
http.createServer((req, res) => {
if (req.method === "OPTIONS") {
res.setHeader('Access-Control-Allow-Origin', '*');
res.setHeader('Access-Control-Allow-Methods', 'POST, GET, PUT, DELETE, OPTIONS');
res.setHeader('Access-Control-Allow-Headers', '*');
res.writeHead(200, { });
res.end();
return;
}
if (req.method === "POST") {
const data = [];
req.on('data', chunk => {
data.push(chunk);
});
req.on('end', () => {
fs.writeFileSync(__dirname + "/file.png", Buffer.concat(data));
res.writeHead(200, { });
res.end();
});
return;
}
}).listen(1234);
I send a PNG file and open it with any problem.
71
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